Signature (I2P Anonymous Network - Java Documentation

java.lang.Object
- net.i2p.data.DataStructureImpl
- - net.i2p.data.SimpleDataStructure
  - - net.i2p.data.Signature

All Implemented Interfaces:

Serializable, DataStructure
```
public class Signature
extends SimpleDataStructure
```
Defines the signature as defined by the I2P data structure spec. By default, a signature is a 40-byte array verifying the authenticity of some data using the DSA-SHA1 algorithm. The signature is the 20-byte R followed by the 20-byte S, both are unsigned integers. As of release 0.9.8, signatures of arbitrary length and type are supported. See SigType.

Author:

jrandom

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type Field Description

static byte[] FAKE_SIGNATURE
Deprecated.
to be removed

static int SIGNATURE_BYTES
40
- Fields inherited from class net.i2p.data.SimpleDataStructure
  _data

Fields
Modifier and Type	Field	Description
`static byte[]`	`FAKE_SIGNATURE`	Deprecated. to be removed
`static int`	`SIGNATURE_BYTES`	40

Constructor Summary

Constructors
Constructor	Description
`Signature()`
`Signature(byte[] data)`
`Signature(SigType type)`	Unknown type not allowed as we won't know the length to read in the data.
`Signature(SigType type, byte[] data)`	Should we allow an unknown type here?

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`equals(Object obj)`	Warning - this returns true for two different classes with the same size and same data, e.g.
`SigType`	`getType()`
`int`	`hashCode()`	We assume the data has enough randomness in it, so use the first 4 bytes for speed.
`int`	`length()`	The legal length of the byte array in this data structure
`String`	`toString()`

Methods inherited from class net.i2p.data.DataStructureImpl
read

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from class net.i2p.data.SimpleDataStructure
calculateHash, fromBase64, fromByteArray, getData, readBytes, setData, toBase64, toByteArray, writeBytes

- Field Detail
  - SIGNATURE_BYTES
```
public static final int SIGNATURE_BYTES
```
    40
  - FAKE_SIGNATURE
```
@Deprecated
public static final byte[] FAKE_SIGNATURE
```
    Deprecated.
    to be removed
    
    all zeros
- Constructor Detail
  - Signature
```
public Signature()
```
  - Signature
```
public Signature(SigType type)
```
    Unknown type not allowed as we won't know the length to read in the data.
    
    Parameters:
    
    type - non-null
    
    Since:
    
    0.9.8
  - Signature
```
public Signature(byte[] data)
```
  - Signature
```
public Signature(SigType type,
                 byte[] data)
```
    Should we allow an unknown type here?
    
    Parameters:
    
    type - non-null
    
    Since:
    
    0.9.8
- Method Detail
  - length
```
public int length()
```
    Description copied from class: SimpleDataStructure
    
    The legal length of the byte array in this data structure
    
    Specified by:
    
    length in class SimpleDataStructure
  - getType
```
public SigType getType()
```
    Returns:
    
    non-null
    
    Since:
    
    0.9.8
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class SimpleDataStructure
    
    Since:
    
    0.9.8
  - hashCode
```
public int hashCode()
```
    Description copied from class: SimpleDataStructure
    
    We assume the data has enough randomness in it, so use the first 4 bytes for speed. If this is not the case, override in the extending class.
    
    Overrides:
    
    hashCode in class SimpleDataStructure
    
    Since:
    
    0.9.17
  - equals
```
public boolean equals(Object obj)
```
    Description copied from class: SimpleDataStructure
    
    Warning - this returns true for two different classes with the same size and same data, e.g. SessionKey and SessionTag, but you wouldn't put them in the same Set, would you?
    
    Overrides:
    
    equals in class SimpleDataStructure
    
    Since:
    
    0.9.17

Class Signature

Field Summary

Fields inherited from class net.i2p.data.SimpleDataStructure

Constructor Summary

Method Summary

Methods inherited from class net.i2p.data.DataStructureImpl

Methods inherited from class java.lang.Object

Methods inherited from class net.i2p.data.SimpleDataStructure

Field Detail

SIGNATURE_BYTES

FAKE_SIGNATURE

Constructor Detail

Signature

Signature

Signature

Signature

Method Detail

length

getType

toString

hashCode

equals